Definitions

Exhalant passage

Anterior to gill chamber leading to large anterior opening, with scaphognathite for driving water outward.
[McLaughlin, 1980]

Canal in front of gill chamber containing scaphognathite which functions for driving water outward, leads to large anterior opening.
[Moore and McCormick, 1969]

(Taxon-specific: Order Decapoda) On each side of cephalothorax, narrow chamber or canal leading from branchial chamber to exterior at anterior end. Water current driven by scaphognathite.
[Stachowitsch, 1992]